SR problem, some kind of cut. Please help!

[Gutling]

Okay, here is the setup GT25R, 550cc, z32, walboro, enthalpy ecu (z32, gt25r, 550, speed cut), mbc 12psi, fmic, hks ssqv

Ever since installing the turbo and the injectors (have since installed ecu to try to fix it, didnt work) it has been doing this, it will idle and drive fine, until either half throttle 5-6000rpms, or 1/4 throttle 6000rpms, or full throttle 4000rpms, the more throttle the sooner it does it. What it does is like a cut, it just stops going. no backfiring, stuttering, nothing, just quits. until u release the throttle for a few seconds, then it will go again. any gear, any boost, just the more u give it gas the sooner it cuts it. mafs is good, wiring is good, ecu is good. runs a little rich now but not too bad. please any suggestions?

[nametakennow]

What kind of engine management do you have?

If it's a stock SR ECU, it may think you're overboosting, use an SAFC to correct or get a tuned ECU.

If it's already tuned... well, I'll wait for an expert to figure that one out... sounds like a bad tune.

[Gutling]

Enthalpy tune, and I got it after the problem started. Thought it was having some factory cut of some sort, so got tuned ecu. Also so I could get rid of SAFC, it was causing me some other problems

[InsanityInc]

Isn't enthalpy the company that just keeps your ECU for a week then sends it back to you the same?

[Gutling]

no enthalpy is a good company, a lot of my friends have their ecus tuned there (sends u a daughterboard back, whenever u upgrade again sends new daughterboard overnight so ur not down) his tune works real good on my car, but like i said the problem was before i got a tune.

[InsanityInc]

Also, if your ECU is in fact still stock, that would explain your problem, since I think the SR has a closed loop WOT fuel map like most older nissans, meaning your injectors will just start dumping ungodly amounts of fuel into your engine that it'll never know about since they're 550cc, and it thinks they're 370cc.

[Gutling]

Argh do you bother to read my posts? I appreciate the help but a blind man cant tell me what color to paint my house. It was doing the problem before ecu, ecu was sent off and tuned for car to try to correct it, it still does it with tuned ecu.

[InsanityInc]

Argh do you bother to read my posts? I appreciate the help but a blind man cant tell me what color to paint my house. It was doing the problem before ecu, ecu was sent off and tuned for car to try to correct it, it still does it with tuned ecu.

Perhaps you should read mine as well. If I recall, enthalpy doesn't actually tune your ECU. There was some big controversy about it if I'm remembering correctly.
Modified by InsanityInc at 6:56 PM 8/7/2005

[Gutling]

I searched and coulndnt find nothing, just a bunch of good stuff about enthalpy. was it on this board? i think i have discovered it though, i think b/c of the injectors they are dumping way to much fuel (running real rich at wot) according to my air/fuel gague it only happens when the last bar lights up (really rich) then it cuts. So i am ordering a nismo adj fuel pressure regulator tommorow, and cut down the fuel psi some and see if that helps.

[InsanityInc]

You can cut it down with an AFPR, but that might cause your car to run funny under non WOT conditions. Have you tried using stock SR injectors?

[Gutling]

No, they were mangled getting them out. dont have any extras within easy reach, would have to order some offline.

[Gutling]

Alright worked on it more today, voltage is good from mafs to ecu, reading the same at both ends. fuel pressure is good, timing is good. still cuts it at exactly 3vs at the maf. any other ideas or things to check?